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CVE-2026-72015: fs/resctrl: Fix double-add of pseudo-locked region's RMID to free list

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-15 · updated 2026-08-23

Description

In the Linux kernel, the following vulnerability has been resolved: fs/resctrl: Fix double-add of pseudo-locked region's RMID to free list A pseudo-locked group's RMID is freed when it is created. On unmount rmdir_all_sub() unconditionally frees all RMID of all groups, resulting in a double-free of the pseudo-locked group's RMID. The consequence of this is that the original free results in the pseudo-locked group's RMID being added to the rmid_free_lru linked list and the second free then attempts to add the same RMID entry to the rmid_free_lru again. Do not double-free a pseudo-locked group's RMID.

Affected products

• Linux kernel: 4.19 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/52007bfdce5310e8c8a29849bfbfb188a1e50ca0
• https://git.kernel.org/stable/c/52b769165f20b38092f28ce064b4b143471540a7
• https://git.kernel.org/stable/c/9168176894332312c12ef052e784735dbf4ffe3f
• https://git.kernel.org/stable/c/ad12e70d7dc3c94a05efc61d1e4861078e0e162b
• https://git.kernel.org/stable/c/b2fe9e140aa94b2816aab7ebc692b543e418f5e3
• https://git.kernel.org/stable/c/b9f089723aee892efc77c349ae47a6b452b293c4
• https://git.kernel.org/stable/c/bab7dbba38ed3011972c3d9be2dcdca7575cbe32
• https://git.kernel.org/stable/c/f7628eea9212e185a09df3aea603ca8580b8678d

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